Speaking at a rally of terror groups in Gaza via video hookup from a hideout in Lebanon, Nasrallah claimed Hizbullah does not need nuclear weapons to rain a “devastating blow” on Israel.

In an address to discuss the possibility of an attack on Israel in the event of a regional conflict, Nasrallah said Hizbullah had identified Israel's vulnerabilities. "We understand the weaknesses of Israel, its main economic and industrial sites, its chemical and nuclear installations,” Nasrallah told the gathering.

"If they do not have any limits, we will not have any either,” he warned, adding in an interview a few hours later with Beirut-based Al-Mayadeen television, “If Israel targets Iran, America bears responsibility.”

He added that according to Iranian officials, if Israel were to attack Iran, “the response will not be just inside the Israeli entity; American bases in the entire region could become Iranian targets.”

It was just such a scenario that the United States allegedly attempted to avoid by proposing a secret deal with Tehran. The alleged proposal, officially and firmly denied by the White House, involved a “hands off” approach by the U.S. if Israel were attack Iranian nuclear installations, in exchange for a similar policy by Tehran towards U.S. military installations in the Persian Gulf.

Nasrallah also blamed Israel for the current brutality in Syria, saying that Western and Arab countries are involved in trying to topple the regime of President Bashar al-Assad “due to its stance against Israel.”

He added that in case of an Israeli attack, “Hizbullah can turn the lives of Israelis into a [living] hell.”

Israel's Prime Minister Binyamin Netanyahu, for his part, warned Sunday that it would be wise for the international community to set a "clear red line" for Iran to stop its nuclear development activities -- soon. "I think that we should speak the truth -- the international community is not drawing a clear red line for Iran and Iran doesn't see determination from the international community to stop its nuclear program," he said. Netanyahu made the remark Sunday during his opening statement at the weekly government Cabinet meeting.